Hello,
So sad to see that we are quite many to face the same show stopper.
My computer is a Dell XPS 8000 of 2009 initially with Vista, then Windows 7 until Windows 10.
I can't reach Safe Mode nor use my backup image.
It's going to be nearly 1 month now that I accepted this "mortal" update.
It ruins my family computer.
I've tried diskpart, dism but can't succeed because the volume associated to the OS partition is lost.
I cannot clean the latest update image since I can choose a volume or path to it.
I am very sad to see also that there seems to be no solution except re-init/re-install.
I feel like a rat in a trap.
This is not really fair at all